<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <script>
        var r = /([0-9a-zA-Z]+)@([0-9a-zA-Z]+(\.[0-9a-zA_Z]+)+)/
        var str = '这是我的邮箱 ：chenkaiyu@qq.com';
        console.log(r.test(str));


    </script>
</body>

</html>